Which common process happens when iron is exposed to oxygen and moisture over time forming a reddish-brown coating?
A
Sublimation
B
Reduction
C
Neutralisation
D
Oxidation forming iron oxide rust
Correct Answer: Option D — Oxidation forming iron oxide rust
Explanation:
Rusting is an oxidation process where iron reacts with oxygen and water to form iron oxide a reddish-brown substance that weakens and corrodes iron structures over time.